Populate a vector with all multimap values with a given key

Question

Given a multimap M what\'s a neat way to create a vector of all values in M with a specific key.

e.g given a multimap how c

Answer 1

Let's go lambda

given: multimap M

requested: vector (of all values in M with a specific key 'a'.)

method:

std::pair aRange = M.equal_range('a')
std::vector aVector;
std::transform(aRange.first, aRange.second,std::back_inserter(aVector), [](std::pair element){return element.second;});         

System environment:

1. compiler: gcc (Ubuntu 5.3.1-14ubuntu2.1) 5.3.1 20160413 (with -std=c++11)
2. os: ubuntu 16.04

Code example:

#include 
#include 
#include